#53 Audrey and Erich Spangenberg

$9,516,620

Living Area: 14,139 sq ft

Year Built: 1996

Land Value: $5,529,680

Noteworthy: 7 fireplaces

In the business, they are called “patent trolls.” The couple buys patent rights but don’t actually use the technology—they just sue others who do. He recently joined forces with Priceline founder Jay Walker, who is suing more than 100 different companies for violating various patents he holds.